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A bar magnet of magnetic moment 3 Am^(2)...

A bar magnet of magnetic moment 3 `Am^(2)` is placed in a uniform magnetic induction of `2xx10^(3)` T if each pole of the magnet experiences a force of `6xx10^(-4)` T if each pole of the magnet experience a force of `6xx10^(-4)` N then the length of the magnet is

A

0.1

B

0.02 m

C

0.3 m

D

0.5 m

Text Solution

Verified by Experts

The correct Answer is:
A
By definition B=`("Force")/("pole strength") therefore F=mB` and magnetic moment M=`M xx 2l`
`therefore 2l=(3xx2xx10^(-5))/(6xx10^(-4))=10^(-1)=0.1 m`
`therefore` Length of the magneti =0.1 m
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